:root {
    --primary: #1a73e8;
    --secondary: #0d47a1;
    --accent: #00bcd4;
    --dark: #121212;
    --darker: #0a0a0a;
    --light: #f5f5f5;
    --gray: #424242;
    --success: #4caf50;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background-color: var(--dark);
    color: var(--light);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, var(--darker), var(--secondary));
    padding: 1rem 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo img {
    height: 50px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent), #fff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav a {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 5px 10px;
    border-radius: 4px;
}

nav a:hover {
    color: var(--accent);
    background: rgba(255, 255, 255, 0.1);
}

.mobile-menu {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区域样式 */
.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), 
                url('https://images.unsplash.com/photo-1611605698335-8b1569810432?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
    background-size: cover;
    background-position: center;
    padding: 5rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(26, 115, 232, 0.4);
}

.btn:hover {
    background: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.6);
}

.btn-large {
    padding: 15px 40px;
    font-size: 1.1rem;
}

.btn-accent {
    background: var(--accent);
    box-shadow: 0 4px 15px rgba(0, 188, 212, 0.4);
}

.btn-accent:hover {
    background: #0097a7;
    box-shadow: 0 6px 20px rgba(0, 188, 212, 0.6);
}

/* 特性区域样式 */
.features {
    padding: 5rem 0;
    background-color: var(--darker);
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title h2:after {
    content: '';
    position: absolute;
    width: 70px;
    height: 4px;
    background: var(--accent);
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 30px;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    border-color: var(--accent);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

/* 更新日志样式 */
.changelog {
    padding: 5rem 0;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline:before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--gray);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
    width: 50%;
    padding: 0 40px;
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-content {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    padding: 25px;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.timeline-content:after {
    content: '';
    position: absolute;
    top: 20px;
    width: 0;
    height: 0;
    border-style: solid;
}

.timeline-item:nth-child(odd) .timeline-content:after {
    right: -10px;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent rgba(255, 255, 255, 0.05);
}

.timeline-item:nth-child(even) .timeline-content:after {
    left: -10px;
    border-width: 10px 10px 10px 0;
    border-color: transparent rgba(255, 255, 255, 0.05) transparent transparent;
}

.timeline-date {
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 10px;
    display: block;
}

.timeline-content h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.timeline-content ul {
    padding-left: 20px;
    margin-bottom: 15px;
}

.download-link {
    display: inline-block;
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    margin-top: 10px;
}

/* 下载区域样式 */
.download {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--darker), var(--secondary));
    text-align: center;
}

.download-options {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.download-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 30px;
    width: 280px;
    transition: transform 0.3s;
}

.download-card:hover {
    transform: translateY(-5px);
}

.download-card h3 {
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.version {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    margin: 10px 0;
}

.file-size {
    color: #aaa;
    margin-bottom: 20px;
}

/* 支持设备区域样式 */
.devices {
    padding: 5rem 0;
    background-color: var(--darker);
}

.brands {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin-top: 2rem;
}

.brand {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px 25px;
    border-radius: 8px;
    min-width: 150px;
    text-align: center;
    transition: all 0.3s;
}

.brand:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.05);
}

/* 页脚样式 */
footer {
    background: var(--darker);
    padding: 3rem 0 1.5rem;
    border-top: 1px solid var(--gray);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    position: relative;
    padding-bottom: 10px;
}

.footer-section h3:after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 3px;
    background: var(--accent);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #aaa;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--accent);
}

.copyright {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--gray);
    color: #aaa;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--darker), var(--secondary));
        padding: 20px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

    nav ul.show {
        display: flex;
    }

    nav a {
        display: block;
        padding: 12px 10px;
        border-radius: 4px;
    }

    .mobile-menu {
        display: block;
    }

    .hero h2 {
        font-size: 2.2rem;
    }

    .timeline:before {
        left: 30px;
    }

    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
        left: 0 !important;
    }

    .timeline-item:nth-child(odd) .timeline-content:after {
        left: -10px;
        right: auto;
        border-width: 10px 10px 10px 0;
        border-color: transparent rgba(255, 255, 255, 0.05) transparent transparent;
    }
}